1) Doctor, at times 2) Immunity bestower of sorts 3) Medical man 4) Medical practitioner 5) Vaccinator 1) Vaccinator 
• (n.) One who inoculates; one who propagates plants or diseases by inoculation.
In·oc'u·la`tor noun [ Latin : confer French inoculateur .] One who inoculates; one who propagates plants or diseases by inoculation. 
[n] - a medical practitioner who inoculates people against diseases
inoculator 1. A medical practitioner who inoculates people against diseases. 2. Someone who propagates plants by inoculation; that is, to produce seedlings for revegetation work by germinating seeds, growing cuttings, or using some other method to encourage plant reproduction and growth. 3. To implant (a disease agent or antigen) in a person, ani...